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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '69c4cda334c607134308ad20c9ea2a79ede05b4873078ba061e680e092c5772e' 
  AND token = 'z4zwIj+H+b/v/AOwOzS268IXFgptN6BwjU+oX+w+eNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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