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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fcbcc4246c411cfd68905f4e3516fa0d14e2b1dda6e70add35cd119d8927e374' 
  AND token = 'm0Z5mEGWNG3TavGBJ9bGy4EkK8ifs27urOL93VmyDMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00745

JSON explain

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