Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f25167e97bfe9ae729a00ba8bf855228561a4cc8511660d4d95e4fa0cf4d7c' 
  AND token = 'RC1tdbzwiDZbe9rEJLwMU4dXx9ga8tptgnss664SPoc=' 
  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"
    }
  }
}