Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f531d02e82e053da6f35a5761d0f10a007c9ee73111fa7b96e0438405b37b35a' 
  AND token = 'KhjF+glBII/cH5aw13qxHrKCBMzFVp6tnhQ7IcNX3jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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