Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1054fc8bb9e1f360fff8c4a6d1e7e27fed39e07ca76633652eaee3d4484d8c3' 
  AND token = 'V3pSNd3M+gvPWZWgs1uSJn+WG+VGFj7Y0EsFSMjlEUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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