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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '551ad43d56ed9fe9b0cf84606090811a7b470e6ab72a73f5bd4314451a27a09f' 
  AND token = '+2/yvLE/50JxuO4kLra/q9gq4E7yVqlZ3X9VTr6OPaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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