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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0ed3b853701ee1e9cb4e333ad6035680730eca10dd5b3611c02a3f8cdafb36fe' 
  AND token = 'LnCr6xW/Edokbjo5WPZReSdyDfUk9M5Z3h6oggiZHvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00761

JSON explain

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