Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f073ce033e7bdb819034fb89acf1d222204f56bb85020f72bc6a1ff25f5ff829' 
  AND token = 'oEAQBrceZjeZdUi6omzIT9fdYNwUkPYTrDF4mtSWBj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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