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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d917a2fa9affd444f29a6827d1b637677416f7bb853a0edaded65a614411a4a' 
  AND token = '71hdRMD1laSox970KgbaXcLUN8np9Xa/jxRi/9MEnsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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