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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77db1b367d82b2d8d6fdc56e514024f8be4d0afdabe8faf59717d14401c0bedd' 
  AND token = 'ElSuaJwLtjpn/To/y1VSjY4vkipvcHaqRilyKffEiwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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