Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad78ad773f5cf0a3e3159390cb62452b43aa53527f96a2faa67f6d09f9bfe123' 
  AND token = 'mvIvheWIJFXa75VJyHZcpUCDkgTTmNdAfTmO4zi2ImQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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