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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a479334f7907c4283ef240c4589326bb19236c7e216aa91b5e9e33aed672e541' 
  AND token = 'SkRmh3zofaOYczk1Ny5weuBv8Z1WsAE2r+Vu8IDE/3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01043

JSON explain

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