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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e990377dec5b8246830bbfe1ee10662c333a1426849b992091c7d9c6d9fc0c' 
  AND token = '2hisKzOpl9TZvrUN91EHSE1ktaRNdR656k4LQUW0MrQ=' 
  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"
    }
  }
}