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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '56be7ff98a0787a17b1e2e70200a1e830de33a47a1426b2ee6f0a1d0980e7b5c' 
  AND token = 'KVSJGYiXTbUbmX8/qS8MKyOB3u4H6pI2KrnGgCqwJTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00835

JSON explain

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