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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8334c25376656e1898623c96decc7c0d9451330d044b620844e4da2811e4aae8' 
  AND token = '+4mkP/jqLwTFKQ9Yc9WePxcKfK8APJdefRS1clfFK08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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