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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa5a0a43db2d5ed12b9d60cf0c45f85397bb0c770f29bc9ff2185cac3c790dd' 
  AND token = 'b5wBeeGWVA6I8oF/0eu4uCrilNkfJLyZ5ouP7a+Ixqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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