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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'bb320dba79a083b872a98d3267888d5a5dad0f0d72ab21a932148339a23bcadd' 
  AND token = 'CnCzvDh6ef96I8dRVEURC9xg4N78f74R5PGT3U1nv8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00840

JSON explain

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