Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1eaae34940f354fb7fec8b9fa36a0acd0e0513073c6e10850d3a5a5e31ecfa6' 
  AND token = 'nRWudFnPMFUBgTzQiKYseEhUxe81BJOh1E3omO/3bVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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