Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b892fc1b3c6a626c1a4b7f12c49985c91d3a0fc8e66c7d5d78caaa93833873f3' 
  AND token = 'oad+JdQeUreU2cvmmM1v4t0pZv41qTQk29rTmZQD7R8=' 
  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"
    }
  }
}