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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3d905fcd95d96c4cfe8486ce8eb174a9425ef48bb59a1bac2142ad2a362bd647' 
  AND token = 'LZQmVSNdwqQ935yEZ+QbIDjZhLpMpKafrS6hZDmnJIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01474

JSON explain

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