Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638cdee538c240c8a8ee44a340dc66eed406623feb1cf050fe5d3492e9c55c5d' 
  AND token = 'muSFbOvE1i0nH1XZSRI067lEUc0McY5m9F93p0hOOqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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