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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '63f9b5e8a4062b2be7ec0d1a2e0d639829a1dfe543df70f127c63986d08a3d92' 
  AND token = 'EcJ1wClp8Krj3z6sMc7hIFwS0rhQcU293+ZbrKANhjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00792

JSON explain

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