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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e793a0f33c0179e342b85c6b5f825724a48f097d320ffe9d41742cbbbde3ddbe' 
  AND token = 'UA23QG2XAsdW2DqHHraJoC79EhQzBJi25ADkTZ7eFMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00765

JSON explain

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