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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494ed520306dc3d4d90aca3ddf3f911c7d27866b137210338451465339531e56' 
  AND token = 'ZOX/8FQKJcThNp4sYAtTe0AiczZuM3quC8OF4jKRgQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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