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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1afa27990da9a95d5a33cae09ea06e29088e6e4b8470c707a682dd6754d5a268' 
  AND token = '5e2OT4/PjBbbjbP8YGbHyMx5pH8pOzEitv9m/SmzV5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00742

JSON explain

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