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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b677a87f650cfbc4f2906454ea41d0dada7f742e89794da69a750c22772a9c98' 
  AND token = 'H9AJ/6Hlwcan9h1XZcXxutXYvPx8iB+Sq+xXu4tFAd8=' 
  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"
    }
  }
}