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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8c04484bdae58e9a4d50460fcd1e9a835533dac56916bd0a7aa0c114b6f679eb' 
  AND token = 'AaeX6POJbu0HAofrP2Rm+jIBGw1FD2rPy0Gf20CQ8js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01611

JSON explain

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