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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c0be518d3bfa211508aa4bb2c7381949ff86dc69839f527def369152f4bdbe84' 
  AND token = '/m5se76U+3ET29fkVmR1L4L58QctK3ZLFQDnTa9OUUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00772

JSON explain

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