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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab345b777db745551a501a32e54cab07fb08e07dbf0dbaf286bea1cfd4226d69' 
  AND token = 'hUd73b+LCMFZIQJSZsTS9QuhcOtuN+XdQVupfOCDdYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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