SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8bc480379f92f949b011be029df74719c6792a427aaa7bc2dc06f73d3827b4' 
  AND token = 'Io+i5WF30WSVmezHrUjJIQhh6Z1D0w2Y0ND+owC/xKU=' 
  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"
    }
  }
}