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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5559d754758d42b93d00dc2043da1c34ae909a9d78bb336f80b0b04905f7a21f' 
  AND token = 'uwBIArJ5ZMBZjJVR4EC2kTdj9JXydoP8N+BCLP9tLXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00765

JSON explain

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