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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d2ff7eeb61004f7be8fa563e5886e5da3bd44f51f52a1c299cc3eff7bac6e2' 
  AND token = '4pJltpfJKhhiknyccJnQI/R56QvkfOGHwD32F5V8ONk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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