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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ada4703f5e27b34a64e199352ed69d772c6d6081d539efafb9e090c89427104e' 
  AND token = '4hjW18fpxN5RdsscPAvRzpqgolL6micwzadQG0Hrq58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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