Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a3784b0b7a6721ebc433619aa3aaa0168e8792488297c07b673823ec53011b' 
  AND token = 'g0swyi3C2BvO7FWWE0xZwtVgZif9hUMUDKHdu9bf1to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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