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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0d305e5add6ea3e57e74e18e677a389029c16d870c7c5a501a78d570c5eacbdc' 
  AND token = 'PedeT3kZ6AuP56bTv8atBQhshf6ifZJa/ykyfqj28QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00767

JSON explain

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