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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1c3c740021f015c1cde305c92f028283f74671ab1823f5954367df45895700' 
  AND token = '5w7mTq75LNuxAGx7GFuu4mYOx/94kDYHqqs0IRbRmGA=' 
  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"
    }
  }
}