SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5458ef891089bdc91f03038790f366ef54244f40beaa9fc6017c8f7b6d02a13b' 
  AND token = 'n4drC+MQvuzSg3O+/Ja9TSz7IXGE2brn9jtkV+iGwjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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