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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a350e712e501477b1be9c53608a8599c3d3cf95310bb9c8fff9a88587e337556' 
  AND token = 'vWYE2NvbqoxR5lf0hse+qXoADl5laL2ek9YibNdOnaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01471

JSON explain

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