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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'cd79caebf2695585e76546fbfa974a9225fd3817a08c32af598fdbea54d3b56b' 
  AND token = '3WQor3jwtB+gAu713i9J/z5F/cf2bd59F8YaXWbJj40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00741

JSON explain

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