Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45536d48c8ad8c7fd239446bb93eeb1dbe89bd3d468904b2fd7698c53ac609d0' 
  AND token = 'b46/ErFmZ+Jf0mjjpDPknkiy3vET3JUALJo+aEXxp8Q=' 
  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"
    }
  }
}