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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8517a704c140481b1dc66c69146192dd6cd2c207a6313fa00ebc39e88ac0f117' 
  AND token = 'KXCMuImVOofmM9p+D97+mTDXHiDJ7rLLsXMeJNl2S5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00845

JSON explain

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