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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b8967a66853d1bbec6694e4c19984117da77b70962c928654fb3924c5d4b92' 
  AND token = '0+50BJyIWLI/+Yt6hYv0rDed5mOuZOozfi1ZWAAItyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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