Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e241bffaa50a9f780d26bfa77aa3990c81dd3a0bac445a10fdeb4082987a9c5' 
  AND token = 'Pmx6PlXQkha339cEgZfW4vg8IcQpL23LAEIsrqX2bYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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