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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129f2b56bfb0ceebc4861dfdfd0c64f3f253a03b2d7a6640837a4a6936f121fc' 
  AND token = '2kISK+yAozaEz0DtShyd9kfSdGj6hAhngDO6U1ooqk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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