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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '59d54c7844ee7a31acd656604438b40ba1965c6385be4da05ed91273aa67e580' 
  AND token = '8YjMkxrlPmsirmzc8vGoFlglNAgeQP6zlS87djsFeeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00832

JSON explain

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