SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '432e8563e654778bdcbcae0d11e502a27ddae337f6106da1424e8bbb9e7943ac' 
  AND token = 'VJqjxoODY7rA0BvFo8MZACvVeO9PVohqMJAIuExq/cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00827

JSON explain

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