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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02cb31f68f14f7c872f64fb6a1b42d631ad292f532242211b75f8aa150822d7' 
  AND token = 'P29Y98u4I7H6DtjqytvnhBiSrpEpBJrvvOb4Mz9fCvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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