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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac9d5986506e368a8a7688df34fe365a37cbc567eacef00cb38dd919434c1ab' 
  AND token = 'g79i+pG1xs1h2JKzNEu3WsljIXa79Ldy6ABUg5cbf6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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