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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e96a513858da83131b07c15a0f482ea0d7a1069540ed2419d7391f3efdf54b90' 
  AND token = 'ZJb+rloB7aGcCmycdVnJvsoHCGAnCUwjcOxweuI5g1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00833

JSON explain

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