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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7e1164777c3be39c9f4a3693b64e486862cdd47d00ca43dfd40d76c7bd3080c0' 
  AND token = '456sBgRNQOfWlSgIR+hMhhmw3A4eXR5/7Bb+mAAq5Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00847

JSON explain

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