Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbb8721478865aef16d6186ac81b59f91987142ed26464bebdeaa350c04c988' 
  AND token = 'iXtDqqD4Wgv87ibm4dRRVSAYRMOC5bgvQdmMKQRc6yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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