Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d68ab9613d538acea53135255365b1b8a20865de36b08d14c446cc82c8e0b3e' 
  AND token = '/d+SNkJr/xF/larwf8wBDkGO2FolyQbXpieHxu73Fao=' 
  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"
    }
  }
}