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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a012c791b06f2a36c6c371df0fcf2be2868066cff311e2fde771d623a6ed43df' 
  AND token = 's4qcUajdffiKMHgnK6rETc+gHVf7hPihbJSNF8157Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00808

JSON explain

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