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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f80107d34028b59146f2320f6eb9fb3200bbcfd06fa5956a2dd7d9e0c28b00' 
  AND token = 'j0wRQfdgiv2HsH9mvpacqMmG+yJS/+oAvpGcMLKk4TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}