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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1102e4e10a56a2686f4a623d253028492019379fbc055c649c85acfeeb4a6fbf' 
  AND token = 'zUAsA+5r75l+GVDZBMJOe0YavGOuoITgIebmaHg61fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00839

JSON explain

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