Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e75a9747224db262c03ca86a4caf9f0a9f0dcc5c1573e4a5e5c93eb0fe2056' 
  AND token = '3K/iNBVG+DqLsLtr+gN6fSQfXyn3RYkcE5S55R2Qsbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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