SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '158a73e39fae16b36f478d72b4b5541acf5e26c1b91f5e70575ce54ac9a8a873' 
  AND token = 'Dg1eol1+Vz37dglRV5R/hp1RZgjfAOGKv8wkOQZnC0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00772

JSON explain

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