Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c42752c0e9d1c6e33aa271e5363f235e31b13ea2b93ce4e00dffef8168e2fa' 
  AND token = '/rrmV0kpQNi/+i7FfBj1OQ7FfXdfl/aX7mYqbIYcPWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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