Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d262242682347987a7b9c95912f79a7b5c698ee8244c44131847b98050b1a4c' 
  AND token = '42K4I0cJf2Os3glsH+QJlSjKK7tEiZ+H/EQPeEprlpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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