SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d56bcdf4963d0ecb7b95af5caa43d8d413a7b3780511d52fdbf9b182ec220d' 
  AND token = 'ygmuuyZqs3IhfeI2bYU+9SxazsjJx+IfvDCpExeVozg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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