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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfafda64be3e8ac363493c0fb1cb859ae6133f68b35ede73c1c1649b07016aa7' 
  AND token = 'ID/PrUhF3apekOeIwXINe/Jbt3tCAUSy6I9cY6Znz7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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