Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bf9fce4c01ed0de45dddb83b6e3482038ee22b9d1a85c67c404852459f9a50' 
  AND token = 'FNY8y9mbMHZ2reBtZ6Lk8j4POM9rmKP+Hbb8KVMdZOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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