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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '45a39cd65d0a4562868c709bc70f012af113bf7d17a78ef3809b764da06b0a80' 
  AND token = 'tiFSYS/K8cf7GI5BWBevQWLZwpOqYGNt3tNqey03alM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00859

JSON explain

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