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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2be147bb516e870daf808bbbbd5fe7c9f58eac7c145254aed8a102ec289633' 
  AND token = 'UmjTUMhbaPi4USgYxsB9bHhg7Vo7P9VVX27V8/5ROfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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