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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c1d4dc67ab2e43d5167ec3a2a612451aff8d8ae4b97bf39db5b4e7b067d253' 
  AND token = 'adqyfryKcGR2g4bRweZCD8KKXBpCvpgUX2BNDD/acd8=' 
  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"
    }
  }
}