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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75bf57b2b5e7948a9f975285935fec560a2c1163b58a9facba67428b0905f8a' 
  AND token = 'pBG8S5Wz/H6pRpvzpGb7cDrNqb3nsab6V1u+CRPwEGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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