Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15647c316bb1a60af2d4070d3b4b81d38256223b51e8f764073d8147636a7cbe' 
  AND token = 'JkII87cOuxuuv8JS9ylZoRABK27Y0XXQ4NRk0UviDa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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