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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '615c2cfe73136ce57435fbd50f50f1ce9fb9a1e85eb62e624ec0c3eca068efae' 
  AND token = 'ZxNA6lR6du7C9jlVVD19OPhmCgiumL9YdrHjr3LZKGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00875

JSON explain

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