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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a990867cff15a00d085c1624f9b645cea2770f6982564f92c2b52e20453b18b' 
  AND token = 'xOwvAxmo1W0Klx/JBBZpZb1Vwt/n6mfQPStKTItGQZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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