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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f1e6cf39f481324149dd93f5a3dc343ea876b2040b1b5d5d12442357b31262' 
  AND token = '8FNYoJbYLXdZj6dlpK2WpOEDrQBwoyiZs++4ib4L030=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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