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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ca30130d7a73ed71c8117efde719b339049983b070100f81998a594c6fde1171' 
  AND token = 'J/hDsZ8ELjG7OIwa1fxV3wQzOKZNhUGaP8ExO+g5y4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01496

JSON explain

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