Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf749a09ddae633416c1ce47b5bff3680c48d638dd1b462bd71895906aa5e0c' 
  AND token = 'lPsOA3tO2/EjVGz1O2cbKredG50WQTPbcLg75qYeZ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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