SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a07d5c8e513452156773f88b62b6b28974c5973ca531a16e102034fbd762a49' 
  AND token = 'NuCUYTGoPsRxv1X3SjBz5XQrJ+MrFKiDaiw4GfEnVtc=' 
  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"
    }
  }
}