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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '12ddc0bf90b1076881c8949cc4bdb3b718886977781edeb2743b5e2ad61a3fb9' 
  AND token = 'A4OHAUaFpYENf8oNINGhTGJqXOBW0TABQ99cbma9mEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00754

JSON explain

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