Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742fbefd44902cb8171520b85ef464dcb8f339647db6eb4c7f8628c91e7fe1fa' 
  AND token = 'P9U24dy9rK3768EdFpeGDu9/zIoDr5ckFrqeg2zl0Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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