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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2616ab24359df4892c313a6ea6f918aaae6ba817fdd8e3df5a5ccb4706358ecd' 
  AND token = 'P2Nh3IRus/6Tg+sAJxsqXRtdlF//gKI3QajIujwn6KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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