Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8793861e69a256d4d815884406fff4401ce1113f99a8caeba6e213dec8921812' 
  AND token = '3TPZRLt7kGiRh4kb9MuMGlefMwgGaCEjOVOSmHl+0XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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