SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f0149f7dd84fd6fdb79b7e637c4481d905fd0b71c29776212350ac59dcf94b' 
  AND token = 'GqcZmB8zJTkKD7QgJ78jKqfjukYk9UpAKgUNePqayKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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