SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ab88afaf253f3fe317e1698e45f93ea12bd6958defc65ad8e2b2590402520c' 
  AND token = 'YZmGi+ovTMG0clBkGljmhAflchS6E1CLK1dFdgVqGKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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