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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '042a99c19f0a8ee11a123432fd7514ac1a32f72332c2b5d25e630cd121174ea5' 
  AND token = 'TNyxfQCbVw9LK3jCqRK/9bxnXJm0747rE4/UPXFLHRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00759

JSON explain

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